iBasso PB-2 Pelican fully balanced portable, DB-2 Dac . . HiFlight recommended op amps page 16. .

Discussion in 'Portable Headphone Amps' started by jamato8, Dec 13, 2010.
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  1. plutonim
    P71204-121923.jpg P71204-141631.jpg
     
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  2. zilch0md
    Those are 3.7V nominal, per cell, so the four of them are giving you 4.2V x 4 = 16.8V for the first couple of minutes of play, but then it will rapidly come down below the 16V max. iBasso specifies, so no problem there, really.

    The best part is that for the majority of your discharge cycle, you will have 3.7V x 4 = 14.8V, which in my experience with external supplies, would be audibly better than the 12.6V (nominal) that we get with the original 3-cell battery.

    Well done!

    Watch out to avoid deep discharging any one cell below 3.0V. I doubt the charge circuit in the PB2 is intelligent and those individual batteries probably don't have any built-in protection. Over time, one cell can end up getting "out of sync" with the other cells, in terms of voltage at both the top and bottom of a cycle. This is less likely to happen if you avoid deep cycling the pack. (Probably stuff a guy with your DIY skills already knows...)

    Mike
     
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  3. snellemin
    I had some time again to mess around with cable upgrades inside the PB2 and I think I found a happy medium. Mixed copper with silver over the just the sliver alone. Got my deep sub bass back, along with the benefits the silver brought to the table.

    20171223_123448.jpg
     
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  4. Mshenay Contributor
    wooooooooooooooooooooooooooooooow

    I got another PB2, and this time the OpAmps are in correctly! No dummy buffers how ever as I'm going to be using this EXCLUSIVELY for my hard to drive open backs, like my HE 4, Pre Fazor LCD 2 and my AKG K240 Sextett, so far with the Sextett... WOOOOW It's SOOOOOOOOOOOOOOO Much quieter than my last one was. Granted I've got a Schiit Etir, new Power Cables for everything and an upgraded Power Conditioner, but WOW this thing is SUPER quiet. I am using the energizer battery pack as well. If I'm taking my big Heavy OLD fragile planars out the house than I'll have no issues carrying around... the Battery for my Amp [which is a bit bigger than the amp itself]

    All in all wooooooooooow, just WOW Super impressed with this bad boi! An I paid about the same this time as I did the first time I got it! I got lucky and found one on eBay, but just wow! It's ALMOST as good as my NFB10ES2 with Phase Reversal... ALMOST and it's portable ;3 have to say it's wonderful to be back in the Club again!

    20171229_204218.jpg

    Sadly only stock internals for now, aside from the entirely separate battery
     
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  5. zilch0md
    ^ Happy post!

    Puts a smile on my face!

    Thanks!

    Mike
     
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  6. Mshenay Contributor
    Me too! I was worried I wouldn't like the sound with the High Current buffers over the Dummy, but I think the improvements of the battery kinda negate what ever losses the non Dummy Buffers introduce. Plus my portable set up is super specialized! The Head Amp Pico Power [isn't nearly as powerful as I wanted it to be] does a great job with my dynamics, and the PB2 handles my Planars and the AKG K240 Sextett! Plus I have some nice hiRose 6pin to dual 4pin XLR adapters I can use again!
     
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  7. zilch0md
    ^ You are literally "good to go" with just about any headphone, now. :)
     
  8. snellemin
    I got the DB2 not long ago and didn't like what I heard. Sounded dull and I had to turn up the volume on the PB2 to hear details. So I swapped out the opamps in the DAC using two Muses 8832. What a difference it has made. Subbass is cleaner, mids and highs are all there at lower volumes. Still waiting on the Hirose connectors and mogami quad cable to come in, for me to the built the balance cables to connect the PB2 and DB2.
    I also have a pair of WM8741 on order to stick into the DB2. Got inspired doing that, seeing that it can be done @plutonim
     
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  9. zilch0md
    ^ Dude! (I'm envying your skills again!)
     
  10. snellemin
    Sooooo, I didn't want to mess with the DB2 yet, and I opted to swap out the dac inside my D7 Sidewinder instead. The "new" WM8741 does sound different vs the 8740 it replaced. Nicer topend and more "analog" overall. You would think both dacs would sound the same, with the 8741 just having more features. But that is not what my ears tell me. Anyways, sooner or later I'll be changing out the ones in the DB2.

    20180119_085155_HDR.jpg
     
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  11. plutonim
    Check this out :)
    P1080150.JPG
     
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  12. snellemin

    Wow man. That is a serious setup. I had thought about doing that with two Burson classics and no batteries. You went way beyond my idea.

    I really like the Burson V6 classics in the PB2. I should have my other setup of WM8741 in today, so tomorrow the upgrade in the DB2 should happen.
    20180117_094625.jpg
     
    Last edited: Jan 23, 2018
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  13. Mshenay Contributor
    Huh you know I have no battery in my unit... I might be able to fit in a set of those bad bois... I actually have the PLAY on loan with a set of both their red Vivids and the orange Classics, I'm a little scared to try them lol as then I'll need to get them

    @plutonim what are those little bendy things your using?
     
  14. snellemin

    Those bendy thingies are just short extensions. Easy to make if you have some time. I've made some before in my other projects. Even added a Wima cap in some.

    15936848_574485046076400_1996742895435345308_o.jpg 15972566_574485052743066_3976974031545805921_o.jpg
     
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  15. Mshenay Contributor
    What did you find adding the wima what I imagine is a bypass cap, into the mix?

    Also my soldering skills are a bit lacking, I'm curious though would you care to make a set for me?
     
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